Confused!?!?

My daughter is 18months and last month we decided to buy a potty as she has been trying to take her nappied off. So we bought it and the following day she went to it herself and took her nappy off and done a wee then she done the same thing the following morning. So I thought I would get the nursery to try her at the potty in there aswell and they said she said no and was a little bit scared. I don't know if it was the nursery that freaked her out because they took her to a staff toilet and the cupboard thingy behind it and put her on it! And now she isn't interested in the potty.

I'm a bit confused! I think we will leave her just now and let her go in her own time again but part of me is annoyed by how the nursery handled it.